Pretty good mate, love the CMYK colour scheme going on. The only problem is that I don't think it will look as good on a dark background. Very nice font chosen too, fits well with the theme of the logo. Overall it is a very unique logo that has the potential to stand out above the rest with it's great use of colour.
Good luck with future designs for him then! It could work on dark backgrounds but then the rest of the design would be limited (Well, I think it would be!) It would be best to stick with light backgrounds though.